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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13757102a834fbf18fceafbf268f6adbbfe7fb25d9caf221adf9795fcb62b11' 
  AND token = 'vh08tzOx4dNNXhlIMmdbC3hPg2NrAH2nthEkOOJqpe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}